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FFmpeg/libavcodec/vorbisdec.c

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  1. /**

  2.  * @file

  3.  * Vorbis I decoder

  4.  * @author Denes Balatoni  ( dbalatoni programozo hu )

  5.  *

  6.  * This file is part of Libav.

  7.  *

  8.  * Libav is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * Libav is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with Libav; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. #include <math.h>

  24. 

  25. #define ALT_BITSTREAM_READER_LE

  26. #include "avcodec.h"

  27. #include "get_bits.h"

  28. #include "dsputil.h"

  29. #include "fft.h"

  30. #include "fmtconvert.h"

  31. 

  32. #include "vorbis.h"

  33. #include "xiph.h"

  34. 

  35. #define V_NB_BITS 8

  36. #define V_NB_BITS2 11

  37. #define V_MAX_VLCS (1 << 16)

  38. #define V_MAX_PARTITIONS (1 << 20)

  39. 

  40. #undef NDEBUG

  41. #include <assert.h>

  42. 

  43. typedef struct {

  44.     uint8_t      dimensions;

  45.     uint8_t      lookup_type;

  46.     uint8_t      maxdepth;

  47.     VLC          vlc;

  48.     float       *codevectors;

  49.     unsigned int nb_bits;

  50. } vorbis_codebook;

  51. 

  52. typedef union  vorbis_floor_u  vorbis_floor_data;

  53. typedef struct vorbis_floor0_s vorbis_floor0;

  54. typedef struct vorbis_floor1_s vorbis_floor1;

  55. struct vorbis_context_s;

  56. typedef

  57. int (* vorbis_floor_decode_func)

  58.     (struct vorbis_context_s *, vorbis_floor_data *, float *);

  59. typedef struct {

  60.     uint8_t floor_type;

  61.     vorbis_floor_decode_func decode;

  62.     union vorbis_floor_u {

  63.         struct vorbis_floor0_s {

  64.             uint8_t       order;

  65.             uint16_t      rate;

  66.             uint16_t      bark_map_size;

  67.             int32_t      *map[2];

  68.             uint32_t      map_size[2];

  69.             uint8_t       amplitude_bits;

  70.             uint8_t       amplitude_offset;

  71.             uint8_t       num_books;

  72.             uint8_t      *book_list;

  73.             float        *lsp;

  74.         } t0;

  75.         struct vorbis_floor1_s {

  76.             uint8_t       partitions;

  77.             uint8_t       partition_class[32];

  78.             uint8_t       class_dimensions[16];

  79.             uint8_t       class_subclasses[16];

  80.             uint8_t       class_masterbook[16];

  81.             int16_t       subclass_books[16][8];

  82.             uint8_t       multiplier;

  83.             uint16_t      x_list_dim;

  84.             vorbis_floor1_entry *list;

  85.         } t1;

  86.     } data;

  87. } vorbis_floor;

  88. 

  89. typedef struct {

  90.     uint16_t      type;

  91.     uint32_t      begin;

  92.     uint32_t      end;

  93.     unsigned      partition_size;

  94.     uint8_t       classifications;

  95.     uint8_t       classbook;

  96.     int16_t       books[64][8];

  97.     uint8_t       maxpass;

  98.     uint16_t      ptns_to_read;

  99.     uint8_t      *classifs;

  100. } vorbis_residue;

  101. 

  102. typedef struct {

  103.     uint8_t       submaps;

  104.     uint16_t      coupling_steps;

  105.     uint8_t      *magnitude;

  106.     uint8_t      *angle;

  107.     uint8_t      *mux;

  108.     uint8_t       submap_floor[16];

  109.     uint8_t       submap_residue[16];

  110. } vorbis_mapping;

  111. 

  112. typedef struct {

  113.     uint8_t       blockflag;

  114.     uint16_t      windowtype;

  115.     uint16_t      transformtype;

  116.     uint8_t       mapping;

  117. } vorbis_mode;

  118. 

  119. typedef struct vorbis_context_s {

  120.     AVCodecContext *avccontext;

  121.     GetBitContext gb;

  122.     DSPContext dsp;

  123.     FmtConvertContext fmt_conv;

  124. 

  125.     FFTContext mdct[2];

  126.     uint8_t       first_frame;

  127.     uint32_t      version;

  128.     uint8_t       audio_channels;

  129.     uint32_t      audio_samplerate;

  130.     uint32_t      bitrate_maximum;

  131.     uint32_t      bitrate_nominal;

  132.     uint32_t      bitrate_minimum;

  133.     uint32_t      blocksize[2];

  134.     const float  *win[2];

  135.     uint16_t      codebook_count;

  136.     vorbis_codebook *codebooks;

  137.     uint8_t       floor_count;

  138.     vorbis_floor *floors;

  139.     uint8_t       residue_count;

  140.     vorbis_residue *residues;

  141.     uint8_t       mapping_count;

  142.     vorbis_mapping *mappings;

  143.     uint8_t       mode_count;

  144.     vorbis_mode  *modes;

  145.     uint8_t       mode_number; // mode number for the current packet

  146.     uint8_t       previous_window;

  147.     float        *channel_residues;

  148.     float        *channel_floors;

  149.     float        *saved;

  150.     float         scale_bias; // for float->int conversion

  151. } vorbis_context;

  152. 

  153. /* Helper functions */

  154. 

  155. #define BARK(x) \

  156.     (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))

  157. 

  158. static const char idx_err_str[] = "Index value %d out of range (0 - %d) for %s at %s:%i\n";

  159. #define VALIDATE_INDEX(idx, limit) \

  160.     if (idx >= limit) {\

  161.         av_log(vc->avccontext, AV_LOG_ERROR,\

  162.                idx_err_str,\

  163.                (int)(idx), (int)(limit - 1), #idx, __FILE__, __LINE__);\

  164.         return -1;\

  165.     }

  166. #define GET_VALIDATED_INDEX(idx, bits, limit) \

  167.     {\

  168.         idx = get_bits(gb, bits);\

  169.         VALIDATE_INDEX(idx, limit)\

  170.     }

  171. 

  172. static float vorbisfloat2float(unsigned val)

  173. {

  174.     double mant = val & 0x1fffff;

  175.     long exp    = (val & 0x7fe00000L) >> 21;

  176.     if (val & 0x80000000)

  177.         mant = -mant;

  178.     return ldexp(mant, exp - 20 - 768);

  179. }

  180. 

  181. 

  182. // Free all allocated memory -----------------------------------------

  183. 

  184. static void vorbis_free(vorbis_context *vc)

  185. {

  186.     int i;

  187. 

  188.     av_freep(&vc->channel_residues);

  189.     av_freep(&vc->channel_floors);

  190.     av_freep(&vc->saved);

  191. 

  192.     for (i = 0; i < vc->residue_count; i++)

  193.         av_free(vc->residues[i].classifs);

  194.     av_freep(&vc->residues);

  195.     av_freep(&vc->modes);

  196. 

  197.     ff_mdct_end(&vc->mdct[0]);

  198.     ff_mdct_end(&vc->mdct[1]);

  199. 

  200.     for (i = 0; i < vc->codebook_count; ++i) {

  201.         av_free(vc->codebooks[i].codevectors);

  202.         free_vlc(&vc->codebooks[i].vlc);

  203.     }

  204.     av_freep(&vc->codebooks);

  205. 

  206.     for (i = 0; i < vc->floor_count; ++i) {

  207.         if (vc->floors[i].floor_type == 0) {

  208.             av_free(vc->floors[i].data.t0.map[0]);

  209.             av_free(vc->floors[i].data.t0.map[1]);

  210.             av_free(vc->floors[i].data.t0.book_list);

  211.             av_free(vc->floors[i].data.t0.lsp);

  212.         } else {

  213.             av_free(vc->floors[i].data.t1.list);

  214.         }

  215.     }

  216.     av_freep(&vc->floors);

  217. 

  218.     for (i = 0; i < vc->mapping_count; ++i) {

  219.         av_free(vc->mappings[i].magnitude);

  220.         av_free(vc->mappings[i].angle);

  221.         av_free(vc->mappings[i].mux);

  222.     }

  223.     av_freep(&vc->mappings);

  224. }

  225. 

  226. // Parse setup header -------------------------------------------------

  227. 

  228. // Process codebooks part

  229. 

  230. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)

  231. {

  232.     unsigned cb;

  233.     uint8_t  *tmp_vlc_bits;

  234.     uint32_t *tmp_vlc_codes;

  235.     GetBitContext *gb = &vc->gb;

  236.     uint16_t *codebook_multiplicands;

  237. 

  238.     vc->codebook_count = get_bits(gb, 8) + 1;

  239. 

  240.     av_dlog(NULL, " Codebooks: %d \n", vc->codebook_count);

  241. 

  242.     vc->codebooks = av_mallocz(vc->codebook_count * sizeof(*vc->codebooks));

  243.     tmp_vlc_bits  = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_bits));

  244.     tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_codes));

  245.     codebook_multiplicands = av_malloc(V_MAX_VLCS * sizeof(*codebook_multiplicands));

  246. 

  247.     for (cb = 0; cb < vc->codebook_count; ++cb) {

  248.         vorbis_codebook *codebook_setup = &vc->codebooks[cb];

  249.         unsigned ordered, t, entries, used_entries = 0;

  250. 

  251.         av_dlog(NULL, " %u. Codebook\n", cb);

  252. 

  253.         if (get_bits(gb, 24) != 0x564342) {

  254.             av_log(vc->avccontext, AV_LOG_ERROR,

  255.                    " %u. Codebook setup data corrupt.\n", cb);

  256.             goto error;

  257.         }

  258. 

  259.         codebook_setup->dimensions=get_bits(gb, 16);

  260.         if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {

  261.             av_log(vc->avccontext, AV_LOG_ERROR,

  262.                    " %u. Codebook's dimension is invalid (%d).\n",

  263.                    cb, codebook_setup->dimensions);

  264.             goto error;

  265.         }

  266.         entries = get_bits(gb, 24);

  267.         if (entries > V_MAX_VLCS) {

  268.             av_log(vc->avccontext, AV_LOG_ERROR,

  269.                    " %u. Codebook has too many entries (%u).\n",

  270.                    cb, entries);

  271.             goto error;

  272.         }

  273. 

  274.         ordered = get_bits1(gb);

  275. 

  276.         av_dlog(NULL, " codebook_dimensions %d, codebook_entries %u\n",

  277.                 codebook_setup->dimensions, entries);

  278. 

  279.         if (!ordered) {

  280.             unsigned ce, flag;

  281.             unsigned sparse = get_bits1(gb);

  282. 

  283.             av_dlog(NULL, " not ordered \n");

  284. 

  285.             if (sparse) {

  286.                 av_dlog(NULL, " sparse \n");

  287. 

  288.                 used_entries = 0;

  289.                 for (ce = 0; ce < entries; ++ce) {

  290.                     flag = get_bits1(gb);

  291.                     if (flag) {

  292.                         tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;

  293.                         ++used_entries;

  294.                     } else

  295.                         tmp_vlc_bits[ce] = 0;

  296.                 }

  297.             } else {

  298.                 av_dlog(NULL, " not sparse \n");

  299. 

  300.                 used_entries = entries;

  301.                 for (ce = 0; ce < entries; ++ce)

  302.                     tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;

  303.             }

  304.         } else {

  305.             unsigned current_entry  = 0;

  306.             unsigned current_length = get_bits(gb, 5) + 1;

  307. 

  308.             av_dlog(NULL, " ordered, current length: %u\n", current_length);  //FIXME

  309. 

  310.             used_entries = entries;

  311.             for (; current_entry < used_entries && current_length <= 32; ++current_length) {

  312.                 unsigned i, number;

  313. 

  314.                 av_dlog(NULL, " number bits: %u ", ilog(entries - current_entry));

  315. 

  316.                 number = get_bits(gb, ilog(entries - current_entry));

  317. 

  318.                 av_dlog(NULL, " number: %u\n", number);

  319. 

  320.                 for (i = current_entry; i < number+current_entry; ++i)

  321.                     if (i < used_entries)

  322.                         tmp_vlc_bits[i] = current_length;

  323. 

  324.                 current_entry+=number;

  325.             }

  326.             if (current_entry>used_entries) {

  327.                 av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");

  328.                 goto error;

  329.             }

  330.         }

  331. 

  332.         codebook_setup->lookup_type = get_bits(gb, 4);

  333. 

  334.         av_dlog(NULL, " lookup type: %d : %s \n", codebook_setup->lookup_type,

  335.                 codebook_setup->lookup_type ? "vq" : "no lookup");

  336. 

  337. // If the codebook is used for (inverse) VQ, calculate codevectors.

  338. 

  339.         if (codebook_setup->lookup_type == 1) {

  340.             unsigned i, j, k;

  341.             unsigned codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);

  342. 

  343.             float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));

  344.             float codebook_delta_value   = vorbisfloat2float(get_bits_long(gb, 32));

  345.             unsigned codebook_value_bits = get_bits(gb, 4) + 1;

  346.             unsigned codebook_sequence_p = get_bits1(gb);

  347. 

  348.             av_dlog(NULL, " We expect %d numbers for building the codevectors. \n",

  349.                     codebook_lookup_values);

  350.             av_dlog(NULL, "  delta %f minmum %f \n",

  351.                     codebook_delta_value, codebook_minimum_value);

  352. 

  353.             for (i = 0; i < codebook_lookup_values; ++i) {

  354.                 codebook_multiplicands[i] = get_bits(gb, codebook_value_bits);

  355. 

  356.                 av_dlog(NULL, " multiplicands*delta+minmum : %e \n",

  357.                         (float)codebook_multiplicands[i] * codebook_delta_value + codebook_minimum_value);

  358.                 av_dlog(NULL, " multiplicand %u\n", codebook_multiplicands[i]);

  359.             }

  360. 

  361. // Weed out unused vlcs and build codevector vector

  362.             codebook_setup->codevectors = used_entries ? av_mallocz(used_entries *

  363.                                                                     codebook_setup->dimensions *

  364.                                                                     sizeof(*codebook_setup->codevectors))

  365.                                                        : NULL;

  366.             for (j = 0, i = 0; i < entries; ++i) {

  367.                 unsigned dim = codebook_setup->dimensions;

  368. 

  369.                 if (tmp_vlc_bits[i]) {

  370.                     float last = 0.0;

  371.                     unsigned lookup_offset = i;

  372. 

  373.                     av_dlog(vc->avccontext, "Lookup offset %u ,", i);

  374. 

  375.                     for (k = 0; k < dim; ++k) {

  376.                         unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;

  377.                         codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;

  378.                         if (codebook_sequence_p)

  379.                             last = codebook_setup->codevectors[j * dim + k];

  380.                         lookup_offset/=codebook_lookup_values;

  381.                     }

  382.                     tmp_vlc_bits[j] = tmp_vlc_bits[i];

  383. 

  384.                     av_dlog(vc->avccontext, "real lookup offset %u, vector: ", j);

  385.                     for (k = 0; k < dim; ++k)

  386.                         av_dlog(vc->avccontext, " %f ",

  387.                                 codebook_setup->codevectors[j * dim + k]);

  388.                     av_dlog(vc->avccontext, "\n");

  389. 

  390.                     ++j;

  391.                 }

  392.             }

  393.             if (j != used_entries) {

  394.                 av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");

  395.                 goto error;

  396.             }

  397.             entries = used_entries;

  398.         } else if (codebook_setup->lookup_type >= 2) {

  399.             av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");

  400.             goto error;

  401.         }

  402. 

  403. // Initialize VLC table

  404.         if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {

  405.             av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");

  406.             goto error;

  407.         }

  408.         codebook_setup->maxdepth = 0;

  409.         for (t = 0; t < entries; ++t)

  410.             if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)

  411.                 codebook_setup->maxdepth = tmp_vlc_bits[t];

  412. 

  413.         if (codebook_setup->maxdepth > 3 * V_NB_BITS)

  414.             codebook_setup->nb_bits = V_NB_BITS2;

  415.         else

  416.             codebook_setup->nb_bits = V_NB_BITS;

  417. 

  418.         codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;

  419. 

  420.         if (init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits, entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits), sizeof(*tmp_vlc_bits), tmp_vlc_codes, sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes), INIT_VLC_LE)) {

  421.             av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");

  422.             goto error;

  423.         }

  424.     }

  425. 

  426.     av_free(tmp_vlc_bits);

  427.     av_free(tmp_vlc_codes);

  428.     av_free(codebook_multiplicands);

  429.     return 0;

  430. 

  431. // Error:

  432. error:

  433.     av_free(tmp_vlc_bits);

  434.     av_free(tmp_vlc_codes);

  435.     av_free(codebook_multiplicands);

  436.     return -1;

  437. }

  438. 

  439. // Process time domain transforms part (unused in Vorbis I)

  440. 

  441. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)

  442. {

  443.     GetBitContext *gb = &vc->gb;

  444.     unsigned i, vorbis_time_count = get_bits(gb, 6) + 1;

  445. 

  446.     for (i = 0; i < vorbis_time_count; ++i) {

  447.         unsigned vorbis_tdtransform = get_bits(gb, 16);

  448. 

  449.         av_dlog(NULL, " Vorbis time domain transform %u: %u\n",

  450.                 vorbis_time_count, vorbis_tdtransform);

  451. 

  452.         if (vorbis_tdtransform) {

  453.             av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");

  454.             return -1;

  455.         }

  456.     }

  457.     return 0;

  458. }

  459. 

  460. // Process floors part

  461. 

  462. static int vorbis_floor0_decode(vorbis_context *vc,

  463.                                 vorbis_floor_data *vfu, float *vec);

  464. static void create_map(vorbis_context *vc, unsigned floor_number);

  465. static int vorbis_floor1_decode(vorbis_context *vc,

  466.                                 vorbis_floor_data *vfu, float *vec);

  467. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)

  468. {

  469.     GetBitContext *gb = &vc->gb;

  470.     int i,j,k;

  471. 

  472.     vc->floor_count = get_bits(gb, 6) + 1;

  473. 

  474.     vc->floors = av_mallocz(vc->floor_count * sizeof(*vc->floors));

  475. 

  476.     for (i = 0; i < vc->floor_count; ++i) {

  477.         vorbis_floor *floor_setup = &vc->floors[i];

  478. 

  479.         floor_setup->floor_type = get_bits(gb, 16);

  480. 

  481.         av_dlog(NULL, " %d. floor type %d \n", i, floor_setup->floor_type);

  482. 

  483.         if (floor_setup->floor_type == 1) {

  484.             int maximum_class = -1;

  485.             unsigned rangebits, rangemax, floor1_values = 2;

  486. 

  487.             floor_setup->decode = vorbis_floor1_decode;

  488. 

  489.             floor_setup->data.t1.partitions = get_bits(gb, 5);

  490. 

  491.             av_dlog(NULL, " %d.floor: %d partitions \n",

  492.                     i, floor_setup->data.t1.partitions);

  493. 

  494.             for (j = 0; j < floor_setup->data.t1.partitions; ++j) {

  495.                 floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);

  496.                 if (floor_setup->data.t1.partition_class[j] > maximum_class)

  497.                     maximum_class = floor_setup->data.t1.partition_class[j];

  498. 

  499.                 av_dlog(NULL, " %d. floor %d partition class %d \n",

  500.                         i, j, floor_setup->data.t1.partition_class[j]);

  501. 

  502.             }

  503. 

  504.             av_dlog(NULL, " maximum class %d \n", maximum_class);

  505. 

  506.             for (j = 0; j <= maximum_class; ++j) {

  507.                 floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;

  508.                 floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);

  509. 

  510.                 av_dlog(NULL, " %d floor %d class dim: %d subclasses %d \n", i, j,

  511.                         floor_setup->data.t1.class_dimensions[j],

  512.                         floor_setup->data.t1.class_subclasses[j]);

  513. 

  514.                 if (floor_setup->data.t1.class_subclasses[j]) {

  515.                     GET_VALIDATED_INDEX(floor_setup->data.t1.class_masterbook[j], 8, vc->codebook_count)

  516. 

  517.                     av_dlog(NULL, "   masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);

  518.                 }

  519. 

  520.                 for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {

  521.                     int16_t bits = get_bits(gb, 8) - 1;

  522.                     if (bits != -1)

  523.                         VALIDATE_INDEX(bits, vc->codebook_count)

  524.                     floor_setup->data.t1.subclass_books[j][k] = bits;

  525. 

  526.                     av_dlog(NULL, "    book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);

  527.                 }

  528.             }

  529. 

  530.             floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;

  531.             floor_setup->data.t1.x_list_dim = 2;

  532. 

  533.             for (j = 0; j < floor_setup->data.t1.partitions; ++j)

  534.                 floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];

  535. 

  536.             floor_setup->data.t1.list = av_mallocz(floor_setup->data.t1.x_list_dim *

  537.                                                    sizeof(*floor_setup->data.t1.list));

  538. 

  539. 

  540.             rangebits = get_bits(gb, 4);

  541.             rangemax = (1 << rangebits);

  542.             if (rangemax > vc->blocksize[1] / 2) {

  543.                 av_log(vc->avccontext, AV_LOG_ERROR,

  544.                        "Floor value is too large for blocksize: %u (%"PRIu32")\n",

  545.                        rangemax, vc->blocksize[1] / 2);

  546.                 return -1;

  547.             }

  548.             floor_setup->data.t1.list[0].x = 0;

  549.             floor_setup->data.t1.list[1].x = rangemax;

  550. 

  551.             for (j = 0; j < floor_setup->data.t1.partitions; ++j) {

  552.                 for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {

  553.                     floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);

  554. 

  555.                     av_dlog(NULL, " %u. floor1 Y coord. %d\n", floor1_values,

  556.                             floor_setup->data.t1.list[floor1_values].x);

  557.                 }

  558.             }

  559. 

  560. // Precalculate order of x coordinates - needed for decode

  561.             ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);

  562.         } else if (floor_setup->floor_type == 0) {

  563.             unsigned max_codebook_dim = 0;

  564. 

  565.             floor_setup->decode = vorbis_floor0_decode;

  566. 

  567.             floor_setup->data.t0.order          = get_bits(gb,  8);

  568.             floor_setup->data.t0.rate           = get_bits(gb, 16);

  569.             floor_setup->data.t0.bark_map_size  = get_bits(gb, 16);

  570.             floor_setup->data.t0.amplitude_bits = get_bits(gb,  6);

  571.             /* zero would result in a div by zero later *

  572.              * 2^0 - 1 == 0                             */

  573.             if (floor_setup->data.t0.amplitude_bits == 0) {

  574.                 av_log(vc->avccontext, AV_LOG_ERROR,

  575.                        "Floor 0 amplitude bits is 0.\n");

  576.                 return -1;

  577.             }

  578.             floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);

  579.             floor_setup->data.t0.num_books        = get_bits(gb, 4) + 1;

  580. 

  581.             /* allocate mem for booklist */

  582.             floor_setup->data.t0.book_list =

  583.                 av_malloc(floor_setup->data.t0.num_books);

  584.             if (!floor_setup->data.t0.book_list)

  585.                 return -1;

  586.             /* read book indexes */

  587.             {

  588.                 int idx;

  589.                 unsigned book_idx;

  590.                 for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {

  591.                     GET_VALIDATED_INDEX(book_idx, 8, vc->codebook_count)

  592.                     floor_setup->data.t0.book_list[idx] = book_idx;

  593.                     if (vc->codebooks[book_idx].dimensions > max_codebook_dim)

  594.                         max_codebook_dim = vc->codebooks[book_idx].dimensions;

  595.                 }

  596.             }

  597. 

  598.             create_map(vc, i);

  599. 

  600.             /* codebook dim is for padding if codebook dim doesn't *

  601.              * divide order+1 then we need to read more data       */

  602.             floor_setup->data.t0.lsp =

  603.                 av_malloc((floor_setup->data.t0.order + 1 + max_codebook_dim)

  604.                           * sizeof(*floor_setup->data.t0.lsp));

  605.             if (!floor_setup->data.t0.lsp)

  606.                 return -1;

  607. 

  608. #ifdef V_DEBUG /* debug output parsed headers */

  609.             /* debug output parsed headers */

  610.             av_dlog(NULL, "floor0 order: %u\n", floor_setup->data.t0.order);

  611.             av_dlog(NULL, "floor0 rate: %u\n", floor_setup->data.t0.rate);

  612.             av_dlog(NULL, "floor0 bark map size: %u\n",

  613.                     floor_setup->data.t0.bark_map_size);

  614.             av_dlog(NULL, "floor0 amplitude bits: %u\n",

  615.                     floor_setup->data.t0.amplitude_bits);

  616.             av_dlog(NULL, "floor0 amplitude offset: %u\n",

  617.                     floor_setup->data.t0.amplitude_offset);

  618.             av_dlog(NULL, "floor0 number of books: %u\n",

  619.                     floor_setup->data.t0.num_books);

  620.             av_dlog(NULL, "floor0 book list pointer: %p\n",

  621.                     floor_setup->data.t0.book_list);

  622.             {

  623.                 int idx;

  624.                 for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {

  625.                     av_dlog(NULL, "  Book %d: %u\n", idx + 1,

  626.                             floor_setup->data.t0.book_list[idx]);

  627.                 }

  628.             }

  629. #endif

  630.         } else {

  631.             av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");

  632.             return -1;

  633.         }

  634.     }

  635.     return 0;

  636. }

  637. 

  638. // Process residues part

  639. 

  640. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)

  641. {

  642.     GetBitContext *gb = &vc->gb;

  643.     unsigned i, j, k;

  644. 

  645.     vc->residue_count = get_bits(gb, 6)+1;

  646.     vc->residues      = av_mallocz(vc->residue_count * sizeof(*vc->residues));

  647. 

  648.     av_dlog(NULL, " There are %d residues. \n", vc->residue_count);

  649. 

  650.     for (i = 0; i < vc->residue_count; ++i) {

  651.         vorbis_residue *res_setup = &vc->residues[i];

  652.         uint8_t cascade[64];

  653.         unsigned high_bits, low_bits;

  654. 

  655.         res_setup->type = get_bits(gb, 16);

  656. 

  657.         av_dlog(NULL, " %u. residue type %d\n", i, res_setup->type);

  658. 

  659.         res_setup->begin          = get_bits(gb, 24);

  660.         res_setup->end            = get_bits(gb, 24);

  661.         res_setup->partition_size = get_bits(gb, 24) + 1;

  662.         /* Validations to prevent a buffer overflow later. */

  663.         if (res_setup->begin>res_setup->end ||

  664.             res_setup->end > vc->avccontext->channels * vc->blocksize[1] / 2 ||

  665.             (res_setup->end-res_setup->begin) / res_setup->partition_size > V_MAX_PARTITIONS) {

  666.             av_log(vc->avccontext, AV_LOG_ERROR,

  667.                    "partition out of bounds: type, begin, end, size, blocksize: %"PRIu16", %"PRIu32", %"PRIu32", %u, %"PRIu32"\n",

  668.                    res_setup->type, res_setup->begin, res_setup->end,

  669.                    res_setup->partition_size, vc->blocksize[1] / 2);

  670.             return -1;

  671.         }

  672. 

  673.         res_setup->classifications = get_bits(gb, 6) + 1;

  674.         GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)

  675. 

  676.         res_setup->ptns_to_read =

  677.             (res_setup->end - res_setup->begin) / res_setup->partition_size;

  678.         res_setup->classifs = av_malloc(res_setup->ptns_to_read *

  679.                                         vc->audio_channels *

  680.                                         sizeof(*res_setup->classifs));

  681.         if (!res_setup->classifs)

  682.             return AVERROR(ENOMEM);

  683. 

  684.         av_dlog(NULL, "    begin %d end %d part.size %d classif.s %d classbook %d \n",

  685.                 res_setup->begin, res_setup->end, res_setup->partition_size,

  686.                 res_setup->classifications, res_setup->classbook);

  687. 

  688.         for (j = 0; j < res_setup->classifications; ++j) {

  689.             high_bits = 0;

  690.             low_bits  = get_bits(gb, 3);

  691.             if (get_bits1(gb))

  692.                 high_bits = get_bits(gb, 5);

  693.             cascade[j] = (high_bits << 3) + low_bits;

  694. 

  695.             av_dlog(NULL, "     %u class cascade depth: %d\n", j, ilog(cascade[j]));

  696.         }

  697. 

  698.         res_setup->maxpass = 0;

  699.         for (j = 0; j < res_setup->classifications; ++j) {

  700.             for (k = 0; k < 8; ++k) {

  701.                 if (cascade[j]&(1 << k)) {

  702.                     GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)

  703. 

  704.                     av_dlog(NULL, "     %u class cascade depth %u book: %d\n",

  705.                             j, k, res_setup->books[j][k]);

  706. 

  707.                     if (k>res_setup->maxpass)

  708.                         res_setup->maxpass = k;

  709.                 } else {

  710.                     res_setup->books[j][k] = -1;

  711.                 }

  712.             }

  713.         }

  714.     }

  715.     return 0;

  716. }

  717. 

  718. // Process mappings part

  719. 

  720. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)

  721. {

  722.     GetBitContext *gb = &vc->gb;

  723.     unsigned i, j;

  724. 

  725.     vc->mapping_count = get_bits(gb, 6)+1;

  726.     vc->mappings      = av_mallocz(vc->mapping_count * sizeof(*vc->mappings));

  727. 

  728.     av_dlog(NULL, " There are %d mappings. \n", vc->mapping_count);

  729. 

  730.     for (i = 0; i < vc->mapping_count; ++i) {

  731.         vorbis_mapping *mapping_setup = &vc->mappings[i];

  732. 

  733.         if (get_bits(gb, 16)) {

  734.             av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");

  735.             return -1;

  736.         }

  737.         if (get_bits1(gb)) {

  738.             mapping_setup->submaps = get_bits(gb, 4) + 1;

  739.         } else {

  740.             mapping_setup->submaps = 1;

  741.         }

  742. 

  743.         if (get_bits1(gb)) {

  744.             mapping_setup->coupling_steps = get_bits(gb, 8) + 1;

  745.             mapping_setup->magnitude      = av_mallocz(mapping_setup->coupling_steps *

  746.                                                        sizeof(*mapping_setup->magnitude));

  747.             mapping_setup->angle          = av_mallocz(mapping_setup->coupling_steps *

  748.                                                        sizeof(*mapping_setup->angle));

  749.             for (j = 0; j < mapping_setup->coupling_steps; ++j) {

  750.                 GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)

  751.                 GET_VALIDATED_INDEX(mapping_setup->angle[j],     ilog(vc->audio_channels - 1), vc->audio_channels)

  752.             }

  753.         } else {

  754.             mapping_setup->coupling_steps = 0;

  755.         }

  756. 

  757.         av_dlog(NULL, "   %u mapping coupling steps: %d\n",

  758.                 i, mapping_setup->coupling_steps);

  759. 

  760.         if (get_bits(gb, 2)) {

  761.             av_log(vc->avccontext, AV_LOG_ERROR, "%u. mapping setup data invalid.\n", i);

  762.             return -1; // following spec.

  763.         }

  764. 

  765.         if (mapping_setup->submaps>1) {

  766.             mapping_setup->mux = av_mallocz(vc->audio_channels *

  767.                                             sizeof(*mapping_setup->mux));

  768.             for (j = 0; j < vc->audio_channels; ++j)

  769.                 mapping_setup->mux[j] = get_bits(gb, 4);

  770.         }

  771. 

  772.         for (j = 0; j < mapping_setup->submaps; ++j) {

  773.             skip_bits(gb, 8); // FIXME check?

  774.             GET_VALIDATED_INDEX(mapping_setup->submap_floor[j],   8, vc->floor_count)

  775.             GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)

  776. 

  777.             av_dlog(NULL, "   %u mapping %u submap : floor %d, residue %d\n", i, j,

  778.                     mapping_setup->submap_floor[j],

  779.                     mapping_setup->submap_residue[j]);

  780.         }

  781.     }

  782.     return 0;

  783. }

  784. 

  785. // Process modes part

  786. 

  787. static void create_map(vorbis_context *vc, unsigned floor_number)

  788. {

  789.     vorbis_floor *floors = vc->floors;

  790.     vorbis_floor0 *vf;

  791.     int idx;

  792.     int blockflag, n;

  793.     int32_t *map;

  794. 

  795.     for (blockflag = 0; blockflag < 2; ++blockflag) {

  796.         n = vc->blocksize[blockflag] / 2;

  797.         floors[floor_number].data.t0.map[blockflag] =

  798.             av_malloc((n + 1) * sizeof(int32_t)); // n + sentinel

  799. 

  800.         map =  floors[floor_number].data.t0.map[blockflag];

  801.         vf  = &floors[floor_number].data.t0;

  802. 

  803.         for (idx = 0; idx < n; ++idx) {

  804.             map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *

  805.                              ((vf->bark_map_size) /

  806.                               BARK(vf->rate / 2.0f)));

  807.             if (vf->bark_map_size-1 < map[idx])

  808.                 map[idx] = vf->bark_map_size - 1;

  809.         }

  810.         map[n] = -1;

  811.         vf->map_size[blockflag] = n;

  812.     }

  813. 

  814. #ifdef V_DEBUG

  815.     for (idx = 0; idx <= n; ++idx) {

  816.         av_dlog(NULL, "floor0 map: map at pos %d is %d\n", idx, map[idx]);

  817.     }

  818. #endif

  819. }

  820. 

  821. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)

  822. {

  823.     GetBitContext *gb = &vc->gb;

  824.     unsigned i;

  825. 

  826.     vc->mode_count = get_bits(gb, 6) + 1;

  827.     vc->modes      = av_mallocz(vc->mode_count * sizeof(*vc->modes));

  828. 

  829.     av_dlog(NULL, " There are %d modes.\n", vc->mode_count);

  830. 

  831.     for (i = 0; i < vc->mode_count; ++i) {

  832.         vorbis_mode *mode_setup = &vc->modes[i];

  833. 

  834.         mode_setup->blockflag     = get_bits1(gb);

  835.         mode_setup->windowtype    = get_bits(gb, 16); //FIXME check

  836.         mode_setup->transformtype = get_bits(gb, 16); //FIXME check

  837.         GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);

  838. 

  839.         av_dlog(NULL, " %u mode: blockflag %d, windowtype %d, transformtype %d, mapping %d\n",

  840.                 i, mode_setup->blockflag, mode_setup->windowtype,

  841.                 mode_setup->transformtype, mode_setup->mapping);

  842.     }

  843.     return 0;

  844. }

  845. 

  846. // Process the whole setup header using the functions above

  847. 

  848. static int vorbis_parse_setup_hdr(vorbis_context *vc)

  849. {

  850.     GetBitContext *gb = &vc->gb;

  851. 

  852.     if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||

  853.         (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||

  854.         (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {

  855.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");

  856.         return -1;

  857.     }

  858. 

  859.     if (vorbis_parse_setup_hdr_codebooks(vc)) {

  860.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");

  861.         return -2;

  862.     }

  863.     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {

  864.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");

  865.         return -3;

  866.     }

  867.     if (vorbis_parse_setup_hdr_floors(vc)) {

  868.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");

  869.         return -4;

  870.     }

  871.     if (vorbis_parse_setup_hdr_residues(vc)) {

  872.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");

  873.         return -5;

  874.     }

  875.     if (vorbis_parse_setup_hdr_mappings(vc)) {

  876.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");

  877.         return -6;

  878.     }

  879.     if (vorbis_parse_setup_hdr_modes(vc)) {

  880.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");

  881.         return -7;

  882.     }

  883.     if (!get_bits1(gb)) {

  884.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");

  885.         return -8; // framing flag bit unset error

  886.     }

  887. 

  888.     return 0;

  889. }

  890. 

  891. // Process the identification header

  892. 

  893. static int vorbis_parse_id_hdr(vorbis_context *vc)

  894. {

  895.     GetBitContext *gb = &vc->gb;

  896.     unsigned bl0, bl1;

  897. 

  898.     if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||

  899.         (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||

  900.         (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {

  901.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");

  902.         return -1;

  903.     }

  904. 

  905.     vc->version        = get_bits_long(gb, 32);    //FIXME check 0

  906.     vc->audio_channels = get_bits(gb, 8);

  907.     if (vc->audio_channels <= 0) {

  908.         av_log(vc->avccontext, AV_LOG_ERROR, "Invalid number of channels\n");

  909.         return -1;

  910.     }

  911.     vc->audio_samplerate = get_bits_long(gb, 32);

  912.     if (vc->audio_samplerate <= 0) {

  913.         av_log(vc->avccontext, AV_LOG_ERROR, "Invalid samplerate\n");

  914.         return -1;

  915.     }

  916.     vc->bitrate_maximum = get_bits_long(gb, 32);

  917.     vc->bitrate_nominal = get_bits_long(gb, 32);

  918.     vc->bitrate_minimum = get_bits_long(gb, 32);

  919.     bl0 = get_bits(gb, 4);

  920.     bl1 = get_bits(gb, 4);

  921.     vc->blocksize[0] = (1 << bl0);

  922.     vc->blocksize[1] = (1 << bl1);

  923.     if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {

  924.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");

  925.         return -3;

  926.     }

  927.     // output format int16

  928.     if (vc->blocksize[1] / 2 * vc->audio_channels * 2 > AVCODEC_MAX_AUDIO_FRAME_SIZE) {

  929.         av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes "

  930.                "output packets too large.\n");

  931.         return -4;

  932.     }

  933.     vc->win[0] = ff_vorbis_vwin[bl0 - 6];

  934.     vc->win[1] = ff_vorbis_vwin[bl1 - 6];

  935. 

  936.     if ((get_bits1(gb)) == 0) {

  937.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");

  938.         return -2;

  939.     }

  940. 

  941.     vc->channel_residues =  av_malloc((vc->blocksize[1]  / 2) * vc->audio_channels * sizeof(*vc->channel_residues));

  942.     vc->channel_floors   =  av_malloc((vc->blocksize[1]  / 2) * vc->audio_channels * sizeof(*vc->channel_floors));

  943.     vc->saved            =  av_mallocz((vc->blocksize[1] / 4) * vc->audio_channels * sizeof(*vc->saved));

  944.     vc->previous_window  = 0;

  945. 

  946.     ff_mdct_init(&vc->mdct[0], bl0, 1, -vc->scale_bias);

  947.     ff_mdct_init(&vc->mdct[1], bl1, 1, -vc->scale_bias);

  948. 

  949.     av_dlog(NULL, " vorbis version %d \n audio_channels %d \n audio_samplerate %d \n bitrate_max %d \n bitrate_nom %d \n bitrate_min %d \n blk_0 %d blk_1 %d \n ",

  950.             vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);

  951. 

  952. /*

  953.     BLK = vc->blocksize[0];

  954.     for (i = 0; i < BLK / 2; ++i) {

  955.         vc->win[0][i] = sin(0.5*3.14159265358*(sin(((float)i + 0.5) / (float)BLK*3.14159265358))*(sin(((float)i + 0.5) / (float)BLK*3.14159265358)));

  956.     }

  957. */

  958. 

  959.     return 0;

  960. }

  961. 

  962. // Process the extradata using the functions above (identification header, setup header)

  963. 

  964. static av_cold int vorbis_decode_init(AVCodecContext *avccontext)

  965. {

  966.     vorbis_context *vc = avccontext->priv_data ;

  967.     uint8_t *headers   = avccontext->extradata;

  968.     int headers_len    = avccontext->extradata_size;

  969.     uint8_t *header_start[3];

  970.     int header_len[3];

  971.     GetBitContext *gb = &(vc->gb);

  972.     int hdr_type;

  973. 

  974.     vc->avccontext = avccontext;

  975.     dsputil_init(&vc->dsp, avccontext);

  976.     ff_fmt_convert_init(&vc->fmt_conv, avccontext);

  977. 

  978.     if (avccontext->request_sample_fmt == AV_SAMPLE_FMT_FLT) {

  979.         avccontext->sample_fmt = AV_SAMPLE_FMT_FLT;

  980.         vc->scale_bias = 1.0f;

  981.     } else {

  982.         avccontext->sample_fmt = AV_SAMPLE_FMT_S16;

  983.         vc->scale_bias = 32768.0f;

  984.     }

  985. 

  986.     if (!headers_len) {

  987.         av_log(avccontext, AV_LOG_ERROR, "Extradata missing.\n");

  988.         return -1;

  989.     }

  990. 

  991.     if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) {

  992.         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");

  993.         return -1;

  994.     }

  995. 

  996.     init_get_bits(gb, header_start[0], header_len[0]*8);

  997.     hdr_type = get_bits(gb, 8);

  998.     if (hdr_type != 1) {

  999.         av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");

  1000.         return -1;

  1001.     }

  1002.     if (vorbis_parse_id_hdr(vc)) {

  1003.         av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");

  1004.         vorbis_free(vc);

  1005.         return -1;

  1006.     }

  1007. 

  1008.     init_get_bits(gb, header_start[2], header_len[2]*8);

  1009.     hdr_type = get_bits(gb, 8);

  1010.     if (hdr_type != 5) {

  1011.         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");

  1012.         vorbis_free(vc);

  1013.         return -1;

  1014.     }

  1015.     if (vorbis_parse_setup_hdr(vc)) {

  1016.         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");

  1017.         vorbis_free(vc);

  1018.         return -1;

  1019.     }

  1020. 

  1021.     if (vc->audio_channels > 8)

  1022.         avccontext->channel_layout = 0;

  1023.     else

  1024.         avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];

  1025. 

  1026.     avccontext->channels    = vc->audio_channels;

  1027.     avccontext->sample_rate = vc->audio_samplerate;

  1028.     avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;

  1029. 

  1030.     return 0 ;

  1031. }

  1032. 

  1033. // Decode audiopackets -------------------------------------------------

  1034. 

  1035. // Read and decode floor

  1036. 

  1037. static int vorbis_floor0_decode(vorbis_context *vc,

  1038.                                 vorbis_floor_data *vfu, float *vec)

  1039. {

  1040.     vorbis_floor0 *vf = &vfu->t0;

  1041.     float *lsp = vf->lsp;

  1042.     unsigned amplitude, book_idx;

  1043.     unsigned blockflag = vc->modes[vc->mode_number].blockflag;

  1044. 

  1045.     amplitude = get_bits(&vc->gb, vf->amplitude_bits);

  1046.     if (amplitude > 0) {

  1047.         float last = 0;

  1048.         unsigned idx, lsp_len = 0;

  1049.         vorbis_codebook codebook;

  1050. 

  1051.         book_idx = get_bits(&vc->gb, ilog(vf->num_books));

  1052.         if (book_idx >= vf->num_books) {

  1053.             av_log(vc->avccontext, AV_LOG_ERROR,

  1054.                     "floor0 dec: booknumber too high!\n");

  1055.             book_idx =  0;

  1056.         }

  1057.         av_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);

  1058.         codebook = vc->codebooks[vf->book_list[book_idx]];

  1059.         /* Invalid codebook! */

  1060.         if (!codebook.codevectors)

  1061.             return -1;

  1062. 

  1063.         while (lsp_len<vf->order) {

  1064.             int vec_off;

  1065. 

  1066.             av_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);

  1067.             av_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);

  1068.             /* read temp vector */

  1069.             vec_off = get_vlc2(&vc->gb, codebook.vlc.table,

  1070.                                codebook.nb_bits, codebook.maxdepth)

  1071.                       * codebook.dimensions;

  1072.             av_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);

  1073.             /* copy each vector component and add last to it */

  1074.             for (idx = 0; idx < codebook.dimensions; ++idx)

  1075.                 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;

  1076.             last = lsp[lsp_len+idx-1]; /* set last to last vector component */

  1077. 

  1078.             lsp_len += codebook.dimensions;

  1079.         }

  1080. #ifdef V_DEBUG

  1081.         /* DEBUG: output lsp coeffs */

  1082.         {

  1083.             int idx;

  1084.             for (idx = 0; idx < lsp_len; ++idx)

  1085.                 av_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);

  1086.         }

  1087. #endif

  1088. 

  1089.         /* synthesize floor output vector */

  1090.         {

  1091.             int i;

  1092.             int order = vf->order;

  1093.             float wstep = M_PI / vf->bark_map_size;

  1094. 

  1095.             for (i = 0; i < order; i++)

  1096.                 lsp[i] = 2.0f * cos(lsp[i]);

  1097. 

  1098.             AV_DEBUG("floor0 synth: map_size = %d; m = %d; wstep = %f\n",

  1099.                      vf->map_size, order, wstep);

  1100. 

  1101.             i = 0;

  1102.             while (i < vf->map_size[blockflag]) {

  1103.                 int j, iter_cond = vf->map[blockflag][i];

  1104.                 float p = 0.5f;

  1105.                 float q = 0.5f;

  1106.                 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times

  1107. 

  1108.                 /* similar part for the q and p products */

  1109.                 for (j = 0; j + 1 < order; j += 2) {

  1110.                     q *= lsp[j]     - two_cos_w;

  1111.                     p *= lsp[j + 1] - two_cos_w;

  1112.                 }

  1113.                 if (j == order) { // even order

  1114.                     p *= p * (2.0f - two_cos_w);

  1115.                     q *= q * (2.0f + two_cos_w);

  1116.                 } else { // odd order

  1117.                     q *= two_cos_w-lsp[j]; // one more time for q

  1118. 

  1119.                     /* final step and square */

  1120.                     p *= p * (4.f - two_cos_w * two_cos_w);

  1121.                     q *= q;

  1122.                 }

  1123. 

  1124.                 /* calculate linear floor value */

  1125.                 q = exp((((amplitude*vf->amplitude_offset) /

  1126.                           (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))

  1127.                          - vf->amplitude_offset) * .11512925f);

  1128. 

  1129.                 /* fill vector */

  1130.                 do {

  1131.                     vec[i] = q; ++i;

  1132.                 } while (vf->map[blockflag][i] == iter_cond);

  1133.             }

  1134.         }

  1135.     } else {

  1136.         /* this channel is unused */

  1137.         return 1;

  1138.     }

  1139. 

  1140.     av_dlog(NULL, " Floor0 decoded\n");

  1141. 

  1142.     return 0;

  1143. }

  1144. 

  1145. static int vorbis_floor1_decode(vorbis_context *vc,

  1146.                                 vorbis_floor_data *vfu, float *vec)

  1147. {

  1148.     vorbis_floor1 *vf = &vfu->t1;

  1149.     GetBitContext *gb = &vc->gb;

  1150.     uint16_t range_v[4] = { 256, 128, 86, 64 };

  1151.     unsigned range = range_v[vf->multiplier - 1];

  1152.     uint16_t floor1_Y[258];

  1153.     uint16_t floor1_Y_final[258];

  1154.     int floor1_flag[258];

  1155.     unsigned class, cdim, cbits, csub, cval, offset, i, j;

  1156.     int book, adx, ady, dy, off, predicted, err;

  1157. 

  1158. 

  1159.     if (!get_bits1(gb)) // silence

  1160.         return 1;

  1161. 

  1162. // Read values (or differences) for the floor's points

  1163. 

  1164.     floor1_Y[0] = get_bits(gb, ilog(range - 1));

  1165.     floor1_Y[1] = get_bits(gb, ilog(range - 1));

  1166. 

  1167.     av_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1168. 

  1169.     offset = 2;

  1170.     for (i = 0; i < vf->partitions; ++i) {

  1171.         class = vf->partition_class[i];

  1172.         cdim   = vf->class_dimensions[class];

  1173.         cbits  = vf->class_subclasses[class];

  1174.         csub = (1 << cbits) - 1;

  1175.         cval = 0;

  1176. 

  1177.         av_dlog(NULL, "Cbits %u\n", cbits);

  1178. 

  1179.         if (cbits) // this reads all subclasses for this partition's class

  1180.             cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class]].vlc.table,

  1181.                             vc->codebooks[vf->class_masterbook[class]].nb_bits, 3);

  1182. 

  1183.         for (j = 0; j < cdim; ++j) {

  1184.             book = vf->subclass_books[class][cval & csub];

  1185. 

  1186.             av_dlog(NULL, "book %d Cbits %u cval %u  bits:%d\n",

  1187.                     book, cbits, cval, get_bits_count(gb));

  1188. 

  1189.             cval = cval >> cbits;

  1190.             if (book > -1) {

  1191.                 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,

  1192.                 vc->codebooks[book].nb_bits, 3);

  1193.             } else {

  1194.                 floor1_Y[offset+j] = 0;

  1195.             }

  1196. 

  1197.             av_dlog(NULL, " floor(%d) = %d \n",

  1198.                     vf->list[offset+j].x, floor1_Y[offset+j]);

  1199.         }

  1200.         offset+=cdim;

  1201.     }

  1202. 

  1203. // Amplitude calculation from the differences

  1204. 

  1205.     floor1_flag[0] = 1;

  1206.     floor1_flag[1] = 1;

  1207.     floor1_Y_final[0] = floor1_Y[0];

  1208.     floor1_Y_final[1] = floor1_Y[1];

  1209. 

  1210.     for (i = 2; i < vf->x_list_dim; ++i) {

  1211.         unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;

  1212. 

  1213.         low_neigh_offs  = vf->list[i].low;

  1214.         high_neigh_offs = vf->list[i].high;

  1215.         dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin

  1216.         adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;

  1217.         ady = FFABS(dy);

  1218.         err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);

  1219.         off = err / adx;

  1220.         if (dy < 0) {

  1221.             predicted = floor1_Y_final[low_neigh_offs] - off;

  1222.         } else {

  1223.             predicted = floor1_Y_final[low_neigh_offs] + off;

  1224.         } // render_point end

  1225. 

  1226.         val = floor1_Y[i];

  1227.         highroom = range-predicted;

  1228.         lowroom  = predicted;

  1229.         if (highroom < lowroom) {

  1230.             room = highroom * 2;

  1231.         } else {

  1232.             room = lowroom * 2;   // SPEC mispelling

  1233.         }

  1234.         if (val) {

  1235.             floor1_flag[low_neigh_offs]  = 1;

  1236.             floor1_flag[high_neigh_offs] = 1;

  1237.             floor1_flag[i]               = 1;

  1238.             if (val >= room) {

  1239.                 if (highroom > lowroom) {

  1240.                     floor1_Y_final[i] = val - lowroom + predicted;

  1241.                 } else {

  1242.                     floor1_Y_final[i] = predicted - val + highroom - 1;

  1243.                 }

  1244.             } else {

  1245.                 if (val & 1) {

  1246.                     floor1_Y_final[i] = predicted - (val + 1) / 2;

  1247.                 } else {

  1248.                     floor1_Y_final[i] = predicted + val / 2;

  1249.                 }

  1250.             }

  1251.         } else {

  1252.             floor1_flag[i]    = 0;

  1253.             floor1_Y_final[i] = predicted;

  1254.         }

  1255. 

  1256.         av_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",

  1257.                 vf->list[i].x, floor1_Y_final[i], val);

  1258.     }

  1259. 

  1260. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1261. 

  1262.     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);

  1263. 

  1264.     av_dlog(NULL, " Floor decoded\n");

  1265. 

  1266.     return 0;

  1267. }

  1268. 

  1269. // Read and decode residue

  1270. 

  1271. static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,

  1272.                                                            vorbis_residue *vr,

  1273.                                                            unsigned ch,

  1274.                                                            uint8_t *do_not_decode,

  1275.                                                            float *vec,

  1276.                                                            unsigned vlen,

  1277.                                                            int vr_type)

  1278. {

  1279.     GetBitContext *gb = &vc->gb;

  1280.     unsigned c_p_c        = vc->codebooks[vr->classbook].dimensions;

  1281.     unsigned ptns_to_read = vr->ptns_to_read;

  1282.     uint8_t *classifs = vr->classifs;

  1283.     unsigned pass, ch_used, i, j, k, l;

  1284. 

  1285.     if (vr_type == 2) {

  1286.         for (j = 1; j < ch; ++j)

  1287.             do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input

  1288.         if (do_not_decode[0])

  1289.             return 0;

  1290.         ch_used = 1;

  1291.     } else {

  1292.         ch_used = ch;

  1293.     }

  1294. 

  1295.     av_dlog(NULL, " residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1296. 

  1297.     for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?

  1298.         uint16_t voffset, partition_count, j_times_ptns_to_read;

  1299. 

  1300.         voffset = vr->begin;

  1301.         for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error

  1302.             if (!pass) {

  1303.                 unsigned inverse_class = ff_inverse[vr->classifications];

  1304.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1305.                     if (!do_not_decode[j]) {

  1306.                         unsigned temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1307.                                                  vc->codebooks[vr->classbook].nb_bits, 3);

  1308. 

  1309.                         av_dlog(NULL, "Classword: %u\n", temp);

  1310. 

  1311.                         assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]

  1312.                         for (i = 0; i < c_p_c; ++i) {

  1313.                             unsigned temp2;

  1314. 

  1315.                             temp2 = (((uint64_t)temp) * inverse_class) >> 32;

  1316.                             if (partition_count + c_p_c - 1 - i < ptns_to_read)

  1317.                                 classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;

  1318.                             temp = temp2;

  1319.                         }

  1320.                     }

  1321.                     j_times_ptns_to_read += ptns_to_read;

  1322.                 }

  1323.             }

  1324.             for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {

  1325.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1326.                     unsigned voffs;

  1327. 

  1328.                     if (!do_not_decode[j]) {

  1329.                         unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];

  1330.                         int vqbook  = vr->books[vqclass][pass];

  1331. 

  1332.                         if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {

  1333.                             unsigned coffs;

  1334.                             unsigned dim  = vc->codebooks[vqbook].dimensions;

  1335.                             unsigned step = dim == 1 ? vr->partition_size

  1336.                                                      : FASTDIV(vr->partition_size, dim);

  1337.                             vorbis_codebook codebook = vc->codebooks[vqbook];

  1338. 

  1339.                             if (vr_type == 0) {

  1340. 

  1341.                                 voffs = voffset+j*vlen;

  1342.                                 for (k = 0; k < step; ++k) {

  1343.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1344.                                     for (l = 0; l < dim; ++l)

  1345.                                         vec[voffs + k + l * step] += codebook.codevectors[coffs + l];  // FPMATH

  1346.                                 }

  1347.                             } else if (vr_type == 1) {

  1348.                                 voffs = voffset + j * vlen;

  1349.                                 for (k = 0; k < step; ++k) {

  1350.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1351.                                     for (l = 0; l < dim; ++l, ++voffs) {

  1352.                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH

  1353. 

  1354.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d  \n",

  1355.                                                 pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1356.                                     }

  1357.                                 }

  1358.                             } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized

  1359.                                 voffs = voffset >> 1;

  1360. 

  1361.                                 if (dim == 2) {

  1362.                                     for (k = 0; k < step; ++k) {

  1363.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;

  1364.                                         vec[voffs + k       ] += codebook.codevectors[coffs    ];  // FPMATH

  1365.                                         vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];  // FPMATH

  1366.                                     }

  1367.                                 } else if (dim == 4) {

  1368.                                     for (k = 0; k < step; ++k, voffs += 2) {

  1369.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;

  1370.                                         vec[voffs           ] += codebook.codevectors[coffs    ];  // FPMATH

  1371.                                         vec[voffs + 1       ] += codebook.codevectors[coffs + 2];  // FPMATH

  1372.                                         vec[voffs + vlen    ] += codebook.codevectors[coffs + 1];  // FPMATH

  1373.                                         vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];  // FPMATH

  1374.                                     }

  1375.                                 } else

  1376.                                 for (k = 0; k < step; ++k) {

  1377.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1378.                                     for (l = 0; l < dim; l += 2, voffs++) {

  1379.                                         vec[voffs       ] += codebook.codevectors[coffs + l    ];  // FPMATH

  1380.                                         vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];  // FPMATH

  1381. 

  1382.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",

  1383.                                                 pass, voffset / ch + (voffs % ch) * vlen,

  1384.                                                 vec[voffset / ch + (voffs % ch) * vlen],

  1385.                                                 codebook.codevectors[coffs + l], coffs, l);

  1386.                                     }

  1387.                                 }

  1388. 

  1389.                             } else if (vr_type == 2) {

  1390.                                 voffs = voffset;

  1391. 

  1392.                                 for (k = 0; k < step; ++k) {

  1393.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1394.                                     for (l = 0; l < dim; ++l, ++voffs) {

  1395.                                         vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l];  // FPMATH FIXME use if and counter instead of / and %

  1396. 

  1397.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",

  1398.                                                 pass, voffset / ch + (voffs % ch) * vlen,

  1399.                                                 vec[voffset / ch + (voffs % ch) * vlen],

  1400.                                                 codebook.codevectors[coffs + l], coffs, l);

  1401.                                     }

  1402.                                 }

  1403.                             }

  1404.                         }

  1405.                     }

  1406.                     j_times_ptns_to_read += ptns_to_read;

  1407.                 }

  1408.                 ++partition_count;

  1409.                 voffset += vr->partition_size;

  1410.             }

  1411.         }

  1412.     }

  1413.     return 0;

  1414. }

  1415. 

  1416. static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,

  1417.                                         unsigned ch,

  1418.                                         uint8_t *do_not_decode,

  1419.                                         float *vec, unsigned vlen)

  1420. {

  1421.     if (vr->type == 2)

  1422.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);

  1423.     else if (vr->type == 1)

  1424.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);

  1425.     else if (vr->type == 0)

  1426.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);

  1427.     else {

  1428.         av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1429.         return -1;

  1430.     }

  1431. }

  1432. 

  1433. void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)

  1434. {

  1435.     int i;

  1436.     for (i = 0;  i < blocksize;  i++) {

  1437.         if (mag[i] > 0.0) {

  1438.             if (ang[i] > 0.0) {

  1439.                 ang[i] = mag[i] - ang[i];

  1440.             } else {

  1441.                 float temp = ang[i];

  1442.                 ang[i]     = mag[i];

  1443.                 mag[i]    += temp;

  1444.             }

  1445.         } else {

  1446.             if (ang[i] > 0.0) {

  1447.                 ang[i] += mag[i];

  1448.             } else {

  1449.                 float temp = ang[i];

  1450.                 ang[i]     = mag[i];

  1451.                 mag[i]    -= temp;

  1452.             }

  1453.         }

  1454.     }

  1455. }

  1456. 

  1457. // Decode the audio packet using the functions above

  1458. 

  1459. static int vorbis_parse_audio_packet(vorbis_context *vc)

  1460. {

  1461.     GetBitContext *gb = &vc->gb;

  1462.     FFTContext *mdct;

  1463.     unsigned previous_window = vc->previous_window;

  1464.     unsigned mode_number, blockflag, blocksize;

  1465.     int i, j;

  1466.     uint8_t no_residue[255];

  1467.     uint8_t do_not_decode[255];

  1468.     vorbis_mapping *mapping;

  1469.     float *ch_res_ptr   = vc->channel_residues;

  1470.     float *ch_floor_ptr = vc->channel_floors;

  1471.     uint8_t res_chan[255];

  1472.     unsigned res_num = 0;

  1473.     int retlen  = 0;

  1474. 

  1475.     if (get_bits1(gb)) {

  1476.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1477.         return -1; // packet type not audio

  1478.     }

  1479. 

  1480.     if (vc->mode_count == 1) {

  1481.         mode_number = 0;

  1482.     } else {

  1483.         GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)

  1484.     }

  1485.     vc->mode_number = mode_number;

  1486.     mapping = &vc->mappings[vc->modes[mode_number].mapping];

  1487. 

  1488.     av_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,

  1489.             vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1490. 

  1491.     blockflag = vc->modes[mode_number].blockflag;

  1492.     blocksize = vc->blocksize[blockflag];

  1493.     if (blockflag)

  1494.         skip_bits(gb, 2); // previous_window, next_window

  1495. 

  1496.     memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?

  1497.     memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?

  1498. 

  1499. // Decode floor

  1500. 

  1501.     for (i = 0; i < vc->audio_channels; ++i) {

  1502.         vorbis_floor *floor;

  1503.         int ret;

  1504.         if (mapping->submaps > 1) {

  1505.             floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1506.         } else {

  1507.             floor = &vc->floors[mapping->submap_floor[0]];

  1508.         }

  1509. 

  1510.         ret = floor->decode(vc, &floor->data, ch_floor_ptr);

  1511. 

  1512.         if (ret < 0) {

  1513.             av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");

  1514.             return -1;

  1515.         }

  1516.         no_residue[i] = ret;

  1517.         ch_floor_ptr += blocksize / 2;

  1518.     }

  1519. 

  1520. // Nonzero vector propagate

  1521. 

  1522.     for (i = mapping->coupling_steps - 1; i >= 0; --i) {

  1523.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1524.             no_residue[mapping->magnitude[i]] = 0;

  1525.             no_residue[mapping->angle[i]]     = 0;

  1526.         }

  1527.     }

  1528. 

  1529. // Decode residue

  1530. 

  1531.     for (i = 0; i < mapping->submaps; ++i) {

  1532.         vorbis_residue *residue;

  1533.         unsigned ch = 0;

  1534. 

  1535.         for (j = 0; j < vc->audio_channels; ++j) {

  1536.             if ((mapping->submaps == 1) || (i == mapping->mux[j])) {

  1537.                 res_chan[j] = res_num;

  1538.                 if (no_residue[j]) {

  1539.                     do_not_decode[ch] = 1;

  1540.                 } else {

  1541.                     do_not_decode[ch] = 0;

  1542.                 }

  1543.                 ++ch;

  1544.                 ++res_num;

  1545.             }

  1546.         }

  1547.         residue = &vc->residues[mapping->submap_residue[i]];

  1548.         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);

  1549. 

  1550.         ch_res_ptr += ch * blocksize / 2;

  1551.     }

  1552. 

  1553. // Inverse coupling

  1554. 

  1555.     for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed

  1556.         float *mag, *ang;

  1557. 

  1558.         mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;

  1559.         ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;

  1560.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);

  1561.     }

  1562. 

  1563. // Dotproduct, MDCT

  1564. 

  1565.     mdct = &vc->mdct[blockflag];

  1566. 

  1567.     for (j = vc->audio_channels-1;j >= 0; j--) {

  1568.         ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;

  1569.         ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;

  1570.         vc->dsp.vector_fmul(ch_floor_ptr, ch_floor_ptr, ch_res_ptr, blocksize / 2);

  1571.         mdct->imdct_half(mdct, ch_res_ptr, ch_floor_ptr);

  1572.     }

  1573. 

  1574. // Overlap/add, save data for next overlapping  FPMATH

  1575. 

  1576.     retlen = (blocksize + vc->blocksize[previous_window]) / 4;

  1577.     for (j = 0; j < vc->audio_channels; j++) {

  1578.         unsigned bs0 = vc->blocksize[0];

  1579.         unsigned bs1 = vc->blocksize[1];

  1580.         float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;

  1581.         float *saved      = vc->saved + j * bs1 / 4;

  1582.         float *ret        = vc->channel_floors + j * retlen;

  1583.         float *buf        = residue;

  1584.         const float *win  = vc->win[blockflag & previous_window];

  1585. 

  1586.         if (blockflag == previous_window) {

  1587.             vc->dsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);

  1588.         } else if (blockflag > previous_window) {

  1589.             vc->dsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);

  1590.             memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));

  1591.         } else {

  1592.             memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));

  1593.             vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);

  1594.         }

  1595.         memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));

  1596.     }

  1597. 

  1598.     vc->previous_window = blockflag;

  1599.     return retlen;

  1600. }

  1601. 

  1602. // Return the decoded audio packet through the standard api

  1603. 

  1604. static int vorbis_decode_frame(AVCodecContext *avccontext,

  1605.                                void *data, int *data_size,

  1606.                                AVPacket *avpkt)

  1607. {

  1608.     const uint8_t *buf = avpkt->data;

  1609.     int buf_size       = avpkt->size;

  1610.     vorbis_context *vc = avccontext->priv_data ;

  1611.     GetBitContext *gb = &(vc->gb);

  1612.     const float *channel_ptrs[255];

  1613.     int i, len;

  1614. 

  1615.     if (!buf_size)

  1616.         return 0;

  1617. 

  1618.     av_dlog(NULL, "packet length %d \n", buf_size);

  1619. 

  1620.     init_get_bits(gb, buf, buf_size*8);

  1621. 

  1622.     len = vorbis_parse_audio_packet(vc);

  1623. 

  1624.     if (len <= 0) {

  1625.         *data_size = 0;

  1626.         return buf_size;

  1627.     }

  1628. 

  1629.     if (!vc->first_frame) {

  1630.         vc->first_frame = 1;

  1631.         *data_size = 0;

  1632.         return buf_size ;

  1633.     }

  1634. 

  1635.     av_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",

  1636.             get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);

  1637. 

  1638.     if (vc->audio_channels > 8) {

  1639.         for (i = 0; i < vc->audio_channels; i++)

  1640.             channel_ptrs[i] = vc->channel_floors + i * len;

  1641.     } else {

  1642.         for (i = 0; i < vc->audio_channels; i++)

  1643.             channel_ptrs[i] = vc->channel_floors +

  1644.                               len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];

  1645.     }

  1646. 

  1647.     if (avccontext->sample_fmt == AV_SAMPLE_FMT_FLT)

  1648.         vc->fmt_conv.float_interleave(data, channel_ptrs, len, vc->audio_channels);

  1649.     else

  1650.         vc->fmt_conv.float_to_int16_interleave(data, channel_ptrs, len,

  1651.                                                vc->audio_channels);

  1652. 

  1653.     *data_size = len * vc->audio_channels *

  1654.                  (av_get_bits_per_sample_fmt(avccontext->sample_fmt) / 8);

  1655. 

  1656.     return buf_size ;

  1657. }

  1658. 

  1659. // Close decoder

  1660. 

  1661. static av_cold int vorbis_decode_close(AVCodecContext *avccontext)

  1662. {

  1663.     vorbis_context *vc = avccontext->priv_data;

  1664. 

  1665.     vorbis_free(vc);

  1666. 

  1667.     return 0 ;

  1668. }

  1669. 

  1670. AVCodec ff_vorbis_decoder = {

  1671.     "vorbis",

  1672.     AVMEDIA_TYPE_AUDIO,

  1673.     CODEC_ID_VORBIS,

  1674.     sizeof(vorbis_context),

  1675.     vorbis_decode_init,

  1676.     NULL,

  1677.     vorbis_decode_close,

  1678.     vorbis_decode_frame,

  1679.     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),

  1680.     .channel_layouts = ff_vorbis_channel_layouts,

  1681.     .sample_fmts = (const enum AVSampleFormat[]) {

  1682.         AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE

  1683.     },

  1684. };